i see it now... new security scare at Heathrow airport... woman with gel bra!!
i don't think there is enough gel in a gel bra to be considered an issue with the new regulations as only 100ml is allowed to be taken through security checks, and i'm not entirely sure but i wouldn't have thought that there would be more than 100ml of gel in a bra!
although i'd suggest playing it safe and not wearing a gel bra! although i really don't think they will pick up on it. unless you actually ask them.